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When used as an inheritance specifier, protected has this general form: class class-name : protected base-class { // ... By specifying a base class as protected, all public and protected members of the base class become protected members of the derived class. In all cases, private members of the base class remain private to that base. public The public access specifier declares public members of a class. It is also used to publicly inherit a base class. When used to declare public members, it has this general form: class class-name { // private members by default public: // make public // public members }; Members of a class are private by default.

The # operator causes the argument it precedes to be turned into a quoted string. For example, consider this program: #include using namespace std; #define mkstr(s) # s int main() { cout << mkstr(I like C++); return 0; } The preprocessor turns the line cout << mkstr(I like C++); into cout << "I like C++"; The ## operator is used to concatenate two tokens. For example, in the following program, Chapter 4: The Preprocessor and Comments 45 46 Chapter 4: The Preprocessor and Comments #include using namespace std; #define concat(a, b) a ## b int main() { int xy = 10; cout << concat(x, y); return 0; } the preprocessor transforms cout << concat(x, y); into cout << xy; If these operators seem strange to you, keep in mind that they are not needed or used in most programs.

If(something()) { stop = 1; break; } } } } As you can see, the variable stop is used to cancel the two outer loops if some program event occurs. However, a better way to accomplish this is shown below, using a goto: int i, j, k; for(i=0; i<100; i++) { for(j=0; j<10; j++) { for(k=0; k<20; k++) { // ... if(k+4 == j + i) { goto done; } } } } done: // ... As you can see, the use of the goto eliminates the extra overhead that was added by the repeated testing of stop in the previous version. Although the goto as a general-purpose form of loop control should be avoided, it can occasionally be employed with great success.